John mcfarlane



'UNrTED STATES PATENTA OFFICE,

JOHN MCFARLANE, OF WASHINGTON, DISTRIO' OF COLUMBIA, ASSIGNOR OF TVO-THIRDS TO GEORGE J BESSLER AND HENRY VEX, OF SAME PLACE.

STEAM ANAD VACUUM PUMP.

SPECIFICATION forming part of Letters Patent No. 406,590, dated July 9, 1889. Application filed March 27, 18819.l Serial No. 304,922. (No model.)

To @ZZ wir/0111, it may con/cern: with a valve-rod B and driven by any suit'- Be it known that I, JOHN MCFABLANE, able engine. This valve moves' between the citizen of the'United States, residing at NVash` casing A before referred to and a casing C to ington, in the District of Columbia, have in-E be described. Valve Bis provided with four 5 vented certain new and useful Improvements ports c `c d d', the ports c c adapted to 5 5 in Steam and Vacuum Pumps; andl do here-1 register at intervals with the ports c c of casby declare the following to be a full, clear, ing A and the ports d d with the ports d d.` and eXact description of the invention, suclr These ports of valve B are so arranged with as will enable others skilled in the art ,to vrespect to each other and to the ports of cas- 1c which it appertains to make and use the same.` ing A' that upon one stroke of the engine one 6o My invention relates to certain new andi port c will register with its corresponding useful improvements in dredgers, and more port c and one port d with its correspon ding especially to the pumping mechanism of such port d, the remaining ports c and d not regmachine. The object I have in view is to so: istering with their respective ports of casing 15 limprove the pumping mechanism of such ma-` A, while upon the return-stroke of the en- 65 chines that the same will perform a continu-` gine the ports of the valve before registering ous operation, while at the same time it will will be carried from their registering-ports, `occupy a convenient position on the dredger while those not registering at iirst will do so, and occupy but a limited space; anda furthis opening and closing of different sets of zo ther object is to improve the construction ports being continued with each stroke of the 7o and arran gem ent. of the suction and discharge engin e, the arrangement being such that there pipes and the valves used in connection there"l will always be communication between the with. valve and one water and one steam compart- To the accomplishment of the above the ment.

2 5 invention consists in the novel construction The casing C, hereinbefore referred to, is -7 5 and arrangement of cert-ain parts and in thel divided into two compartments D D', and is novel combination of parts, as will be fully provided on its rear face with four ports e e described and illustrated and specifically and e e', one port e and one port e leading claimed. 1 into each compartment. These ports are ar- 3o Reference will be made to the accompanyranged in line with the ports c CZ of casing A, 8o ing drawings, in which Figure l is a longiports e e being in line with ports c c and ports tudinal section through the pumping meche ei in line with ports d d. These ports beanism and discharge-pipes, and Fig. 2 a secing in line with the ports of casing A, it will tional detail showing a modified arrangement of course follow that when the ports of the 35 of the valve in the discharge-pipe. valve B register with the ports of such casing 85 In the drawings, A represents a box or cas- .they will register with those of casingO, and ing suitably lmounted upon the dredger and means thus obtained for admitting water and divided into four compartments, the end comsteam alternately to each of compartments D partments d a being connected with suitable D', the waterbeing admitted to one com- 4o steam-inlets a a and the intermediate compartment as steam is admitted to the other. 9o

partments b with water-inlets h' b. By the Each compartment D D is provided at its provision of these compartments ce and b a front end with an opening f, around which a large volume of steam and water is always pipe E is fitted, said pipes being secured to in readiness when the proper ports are inline. the casing O in any suitable manner, as by 45 Omthe front face this box or casing A is proboltsg, as shown. These pipes E, which form 95 vided with four openings or ports c c and d'd, the suction-pipes of the pump, are of any one for each compartment a b, the ports c c suitable size. rlhey are arranged horizonleading into compartments a and the ports tally of the deck of the dredger, and their d d into compartments Z9. forward ends are each provided with a joint 5o B represents areciproeating valve provided F, which is adapted to pass over the end of roo the dredger and connected with the rdin ary telescope-pipe, which is lowered into the water. At the point where each pipe is connected with the j oint'F arearwardly;opening valve 7L is provided, said valves being hinged to the inside of the pipes E and having suitable seats therein. The pipes E are connected by a Y G, the arms of which are connected with the pipes E at points to the rear of the point of connection between such pipes and the joint F, and surround openings i formed in said pipes.

H is a discharge-pipe connected with the nozzle of Y G, and adapted to be directed toV any part of the dredge where the mud is to be dumped.

The orifice i of each pipe E is provided with a valve k, arranged to swing backwardly into the Y.

In Fig. 2 I show an arrangement by which the valves k may be dispensed with, such arrangement consisting of a single valve I pivoted at the apex of the arms of the Y and adapted to seat upon either of such arms.'

The operation of the lnachine is as follows: The parts all being in position, the engine is started, and at its first stroke wili bring one port d ofthe valve B into line with ports d and e of one compartment b and the chamber D, respectively, thus admitting water to such chamber, one port c at the same time registering' with ports c and c of one com? partment aand the chamber D', steam being thus admitted to the last-named chamber. The. return-stroke of the engine will cause the remaining port o to register with the remaining ports e ando, and thereby admit steam to the chamber D, water at the same time being admitted to chamber D through the suitable ports. By the admission of the steam upon the water in chamber D any water or mud in 4such chamber is forced therefrom and through the pipe E, the valve 7L of suoli pipe being closed and the valve 7o of the Y G opened. During this operation, water having been forced upon the steam in chamber D', a vac- -`uum is formed in such chamber, causing a suction in the pipe E, communicating with suoli chamber, andk thereby drawing the mud bination, with a casing divided into two vao- 't umn-chambers and av casing divided into two sets of water and steam compartments, of a reciprocating valve provided with ports, as described, and arranged to admit water and steam alternately into each vac umn-chamber, as and for the purpose set forth.

2. In a vacuum-pump for dredgers, the com bination, with a casing divided into two vacuum-chambers and a casing divided into two sets of water and steam compartments, of a reciprocating valve provided with ports, as

. described, and arranged to admit water and 1 steam alternately into each vacuum-chamber, and suction-pipes communicating with the vacuumchambers', and valves situated i n such suction-pipes, as set forth.

3. In a vacuum-pump for dred gers, the com-v bination, with a casing divided into two vacn umn-chambers and a casing divided into two sets of Water and steam compartments, of a reciprocating valve provided with ports, as described, and arranged to admit water and steam alternately into each vacuum-chamber, suction-pipes communicating with thc vacuum-chambers, and a Y-shaped discharge communicating with such suction-pipes, and avalve situated in such suction-pipes, and a valve situated in the Y, as set forth.

In testimony whereof I aiiix my signature in presence of two witnesses.

JOHN MCFARLANE. 

